Interval stutter / jitter / duplicated frames bug - workarounds
- Thread starter wiliextreme
- Start date
I think that because Shadowplay work in VFR (at least that what kdenlive said with the video that recorded with Shadowplay), maybe it's not real VFR but timestamp base video (I just search and I was right, see here https://www.nvidia.com/en-us/geforc...4/258077/about-shadowplay-variable-framerate/)
Unfortunately, I don't understand that.
I have a single-PC setup with a 4K monitor.
The racing game runs in a window at 2560x1440.
On the desktop, I also have OBS and other tools for operating and controlling the cameras in the racing game.
I would connect the capture card via HDMI and the monitor via DisplayPort.
I duplicate both displays in Windows.
Then I get the same image content on the capture card as on the screen.
The racing game usually runs in the background, but not minimized.
If I integrate the capture card as a source in OBS, I see the same content as on the screen, right?
How am I supposed to get the racing game fully into the OBS preview?
Sorry for all the "stupid" questions, but I can't imagine how that's supposed to work.
Am I making a mistake?
I have a single-PC setup with a 4K monitor.
The racing game runs in a window at 2560x1440.
On the desktop, I also have OBS and other tools for operating and controlling the cameras in the racing game.
I would connect the capture card via HDMI and the monitor via DisplayPort.
I duplicate both displays in Windows.
Then I get the same image content on the capture card as on the screen.
The racing game usually runs in the background, but not minimized.
If I integrate the capture card as a source in OBS, I see the same content as on the screen, right?
How am I supposed to get the racing game fully into the OBS preview?
Sorry for all the "stupid" questions, but I can't imagine how that's supposed to work.
Am I making a mistake?
qhobbes
Active Member
1. Go to Settings, Video and set the Base (Canvas) Resolution to 3840x2160.
2. On the Settings for your capture card, set the Resolution to 3840x2160.
3. Now you need to crop 1280 horizontally and 720 vertically. If the racing game window is in a corner then it should be easy to calculate how much to crop. For example, if the window was in the top right, you crop 1280 from the left and 720 from the bottom. You can crop a source 2 ways. 1. Click on the source in the preview, hold Alt and click and drag the corners or middle side squares. 2. Right click on the source, Transform, Edit Transform (or Ctrl+E). Here you can manually type in how much you want to crop. Remember those settings in case you need to remove and re-add the source or reset it.
4. You should now have a 2560x1440 source. Go to Settings, Video and set the Base (Canvas) Resolution to 2560x1440. You may need move around the source or re-add and re-crop if not displaying the correct area of the content.
2. On the Settings for your capture card, set the Resolution to 3840x2160.
3. Now you need to crop 1280 horizontally and 720 vertically. If the racing game window is in a corner then it should be easy to calculate how much to crop. For example, if the window was in the top right, you crop 1280 from the left and 720 from the bottom. You can crop a source 2 ways. 1. Click on the source in the preview, hold Alt and click and drag the corners or middle side squares. 2. Right click on the source, Transform, Edit Transform (or Ctrl+E). Here you can manually type in how much you want to crop. Remember those settings in case you need to remove and re-add the source or reset it.
4. You should now have a 2560x1440 source. Go to Settings, Video and set the Base (Canvas) Resolution to 2560x1440. You may need move around the source or re-add and re-crop if not displaying the correct area of the content.
disabling reflex and using game fps limits didn't help. idk what to do anymore
TexelGuy
New Member
Fractional fps recording was the only one that worked for OBS for me. Looking at your screenshot, I think the way you're doing that might not work. OBS only accepts a max 6 digit numerator, so you'll have to find and multiply your refresh rate with a number that results in a numerator value that's below 1,000,000 for the numerator.
You can use this Python code below to quickly calculate the numerator and denominator combo that gives you the smallest decimal value. Just enter the refresh rate you found using displayhz.com into the "refresh_rate" variable and run it. You can run this code online by pasting it into the W3Schools Python compiler.
Python:
min_decimal_value = float('inf')
number_with_min_decimal = None
refresh_rate = 60.000083 # Change this to your refresh rate
for num in range(1000, 20000):
result = num * refresh_rate
if result >= 1000000: # Skip numbers where the result exceeds 1,000,000
continue
decimal_part = result - int(result) # Get the decimal part
if decimal_part < min_decimal_value:
min_decimal_value = decimal_part
number_with_min_decimal = num
print(f"Numerator: {int(number_with_min_decimal * refresh_rate)}")
print(f"Denominator: {number_with_min_decimal}")
print(f"Refresh rate * Denominator: {refresh_rate*number_with_min_decimal}")TexelGuy
New Member
VFR videos can be remuxed to CFR using a tool called mkvmerge.exe, which is included in MKVToolNix. All it will do is change the metadata to say that the video is a constant 60 fps (or other framerates of your choosing), which will make video editing software interpret it as a CFR video. Running the code below in Windows terminal will remux a video to CFR 60 fps, just replace "input.mkv" with your video's file name and format.
Code:
mkvmerge.exe -o output.mkv --default-duration 0:60p input.mkvAs far as I've tested it doesn't cause any issues, if you recorded your VFR video with the game running at 60 fps consistently, the remuxed video should look like a 60 fps video.
This is something OBS could maybe offer as a setting to do automatically if it adds a VFR recording option, since it already has a remuxing feature.
that may work in 'as it were' "AVR" "Average Frame Rate" (https://www.nvidia.com/en-us/geforc...4/258077/about-shadowplay-variable-framerate/ similar to ABR vs VBR case) not the real VFR, but anyway OBS should be updated to work at least with 'so to speak' "AVR"
Sejbo8000
New Member
So I might have made an interesting discovery for this issue or something very similar to it (Don't get your hopes up it might just be a similar issue) So I get duplicated frames when recording and my preview shows a lot of jitter during movement. I never needed vsync since I have Gsync so I always turned it off completely in nvcp and always set my monitor tech to use Gsync. I also always lock the games fps to 60.
Here is the interesting part so I thought what if I turned on fixed refreshrate and turned on 3d application setting in the vsync field globally? I of course restarted the game and obs and suddenly it ran super smooth. I had no more duplicated frames and no more jitter. I then turned off 3d application Vsync and the jitter returned. So the fix for the stutter were both of those settings. The only issue I had then would be screen tearing so I thought that obs might want like fixed refresh more and also want vsync for 3d applications for some reason. Then I remembered that you can assign nvcp settings to specific programs. I then made obs fixed refresh and made only obs have vsync 3d application, I also turned off global vsync 3d application but I still had dup frames and jitter. I had also turned on gsync globally again since I want obs to use fixed refresh and my screen and game to use gsync. Surprisingly enough I turned on global vsync 3d application again while obs had fixed refresh and after restarting obs and the game the dup frames and jitter was gone.
To sum it up turning global vsync in the nvidia control panel to 3d application and making only obs run in Monitor technology: fixed refreshrate fixed my stuttering and dup frame issue. At the same time the game still uses gsync. I will have to properly record now to confirm that it is a proper fix for me but so far it seems to work. Hope it works for someone else too
Here is the interesting part so I thought what if I turned on fixed refreshrate and turned on 3d application setting in the vsync field globally? I of course restarted the game and obs and suddenly it ran super smooth. I had no more duplicated frames and no more jitter. I then turned off 3d application Vsync and the jitter returned. So the fix for the stutter were both of those settings. The only issue I had then would be screen tearing so I thought that obs might want like fixed refresh more and also want vsync for 3d applications for some reason. Then I remembered that you can assign nvcp settings to specific programs. I then made obs fixed refresh and made only obs have vsync 3d application, I also turned off global vsync 3d application but I still had dup frames and jitter. I had also turned on gsync globally again since I want obs to use fixed refresh and my screen and game to use gsync. Surprisingly enough I turned on global vsync 3d application again while obs had fixed refresh and after restarting obs and the game the dup frames and jitter was gone.
To sum it up turning global vsync in the nvidia control panel to 3d application and making only obs run in Monitor technology: fixed refreshrate fixed my stuttering and dup frame issue. At the same time the game still uses gsync. I will have to properly record now to confirm that it is a proper fix for me but so far it seems to work. Hope it works for someone else too
Sejbo8000
New Member
Yes I am using a single pc system with 2 monitors and it has this behavior in both borderless and fullscreen